script(src="scripts/app.bundle.js" async)
script.

  if ('serviceWorker' in navigator) {
    //- console.log('CLIENT: service worker registration in progress.');
    navigator.serviceWorker.register('service-worker.js').then(function() {
      //- console.log('CLIENT: service worker registration complete.');
    }, function() {
      //- console.log('CLIENT: service worker registration failure.');
    });
  }
  else {
    //- console.log('CLIENT: service worker is not supported.');
  }
